CN105430816A - Light-emitting control device, light-emitting system using same and control method - Google Patents

Abstract

The application provides a controlling means for emitting diode LED lamps and lanterns, includes: the electronic controller is used for respectively outputting a high color temperature control signal, a low color temperature control signal and a dimming control signal according to a preset processing program based on external input; a first group of LED emitters; a second group of LED emitters; the first variable output constant current source provides current output to the first group of LED luminous bodies; the second variable output constant current source provides current output to the second group of LED luminous bodies; the first variable output constant current source provides the final current output to the first group of LED luminous bodies according to the high color temperature control signal and the dimming control signal, and the second variable output constant current source provides the final current output to the second group of LED luminous bodies according to the low color temperature control signal and the dimming control signal. The LED luminous body can be simply and effectively controlled in color temperature and brightness continuously or in multiple stages, a comfortable lighting environment is provided according to the living needs of people, and energy is effectively saved.

Description

A lighting control device, a lighting system and a control method using the lighting control device

technical field

This application relates to the application and control field of lamps and lanterns using light-emitting diodes (LEDs). Multiple controlled color temperature adjustment ranges, and can achieve the effect that the color temperature does not change significantly when dimming.

The application is beneficial to be used in domestic and commercial LED lamps or other lighting facilities.

Background technique

With the development of science and technology, semiconductor lighting technology has been widely used in various fields due to its characteristics of energy saving, environmental protection, and long life. voltage, lumen output and color temperature.

For general lighting, it is hoped that LED lamps can be adjusted like ordinary lamps, and obtain lighting effects similar to sunlight or candlelight. This puts forward higher requirements for the color temperature and brightness adjustment of LED lamps.

At present, several methods and structures for changing the output color of LED lamps have been proposed in the prior art. For example, US Patent 4,837,565 proposes the use of red and green LEDs to produce yellow, and US Patent 8,212,466 proposes the use of two sets of LEDs of different wavelengths to produce a combined color temperature according to the planckian locus.

There are still many technical defects in various LED lamp adjustment technologies in the prior art. For example, when there are multiple groups of LEDs, a complex control circuit is required to control each group of LEDs, which increases the design complexity and production cost; when a combination of multiple groups of LEDs is used, a large adjustment range cannot be obtained. Therefore, the industry still needs an LED lamp control system with a simple design and capable of adjusting color temperature and dimming in a wide range.

Contents of the invention

In view of the above defects in the prior art, one of the purposes of the present application is to provide a control device with simple structure and low production cost to control the color temperature and brightness of LED lamps. This application proposes an electronic controller comprising two independent control inputs: color temperature and brightness level. The controller of this application can accept various conventional input methods currently available, such as two independent 0-10V DC lighting control signals, pulse width modulation signals (PWM), and more available LED digital dimming scheme (DLT) control signals , or Digital Addressable Lighting Interface (DALI) uses a single set of signal lines to simultaneously control color temperature and brightness levels. The controller of the present application can control multiple groups of LED strings at the same time, so that at least one group of LEDs is at the maximum output level when the dimming output is the highest, and has the ability to adjust the color temperature of each LED string in a full range. characteristics, thereby improving the overall performance of the LED lighting system. The controller of the present application can be constructed using various technologies known in the art, such as a single-chip microcomputer (MCU), which has low production cost and can be freely programmed to accept a variety of different wired or wireless control signals to achieve static or dynamic control. Individual color temperature and dimming continuous or graduated presets.

According to the first aspect of the present application, a lighting control device is proposed, including:

The electronic controller has a color temperature control input terminal and a dimming control input terminal, which are respectively used to receive an externally input color temperature control input signal and a dimming control input signal, and has a first color temperature control output terminal, a second color temperature control output terminal, and a dimming control output terminal, for outputting a first color temperature control signal and a second color temperature control signal respectively according to a preset processing program based on the color temperature control input signal and the dimming control input signal input externally to adjust the color temperature of the luminous effect, and output a dimming control signal for dimming; the first variable output constant current source includes: a first color temperature control input terminal, coupled to the first color temperature control output terminal of the electronic controller, used When receiving the first color temperature control signal, the dimming control input terminal is coupled to the dimming control output terminal of the electronic controller for receiving the dimming control signal, and the first output terminal provides a first current output; the second can The variable output constant current source includes: a second color temperature control input terminal, coupled to the second color temperature control output terminal of the electronic controller, for receiving a second color temperature control signal, and a dimming control input terminal, coupled to the electronic controller The dimming control output terminal of the controller is used to receive the dimming control signal, and the second output terminal provides a second current output; wherein, the first variable output constant current source is adjusted according to the first color temperature control signal The magnitude of the first current output, and adjust the ratio of the magnitude of the first current output according to the two dimming control signals, and the second variable output constant current source adjusts the ratio of the magnitude of the first current output according to the second color temperature control signal the size of the second current output, and adjust the ratio of the size of the second current output according to the dimming control signal, by controlling the first current output of the first variable output constant current source and the The size and ratio of the second current output of the second variable output constant current source are used to adjust the color temperature and/or the luminous effect of dimming.

According to the second aspect of the present application, the first color temperature control signal is a first pulse width color temperature control signal, the second color temperature control signal is a second pulse width color temperature control signal, and the dimming control signal is a DC voltage level dimming control signal.

According to the third aspect of the present application, the electronic controller includes: a micro control unit, which stores a preset programmable program, and includes a plurality of IO channels, which are used to respectively receive one or more of the following input control signals : The main switch detection input signal, the control input signal of the digital dimming scheme, the color temperature control input signal of the DC voltage format, the dimming control input signal of the DC voltage format, the micro control unit is based on the above input control signal and the internal preset Program, output internal PWM color temperature control signal, internal PWM dimming control signal, PWM synchronous signal of 50% duty ratio; The light control signal output terminal is coupled and receives the external PWM color temperature control input signal and the external PWM dimming control input signal, and is used to determine whether to select the internal PWM color temperature control signal and the internal PWM dimming control signal output by the micro control unit Or choose the external PWM color temperature control input signal and the external PWM dimming control input signal, and output the selected internal PWM color temperature control signal or the external PWM color temperature control input signal as the PWM color temperature control signal to the PWM to The pulse width processing unit outputs the selected internal PWM dimming control signal or the external PWM dimming control input signal as the PWM dimming control signal to the PWM voltage integrator; the PWM to pulse width processing unit is coupled to the The output of the PWM source selector is used to generate the first pulse width color temperature control signal to the first variable output constant current source based on the input PWM color temperature control signal and the PWM synchronization signal with a 50% duty cycle, and generate The second pulse width color temperature control signal is sent to the second variable output constant current source, at any time, one of the first pulse width color temperature control signal and the second pulse width color temperature control signal will be at full degree output state, while the other will be controlled between the maximum output state and the minimum output state; the PWM voltage integrator, coupled to the output of the PWM source selector, is used to integrate the input PWM dimming control signal , generating a stable DC voltage value proportional to the PWM pulse width, and providing it as the DC level dimming control signal to the first variable output constant current source and the second variable output constant current source.

According to the fourth aspect of the present application, the PWM to pulse width processing unit includes: an inverter, which receives the PWM synchronous signal with a duty cycle of 50%, and inverts it, and provides it to the first exclusive OR gate ( G1); the first XOR gate includes a first input end for receiving the output of the inverter and a second input end for receiving the PWM color temperature control signal, and the inverter's The output is compared with the PWM color temperature control signal, if the duty cycle of the PWM color temperature control signal is more than 50%, a high level output can be obtained at the output terminal of the first XOR gate, and the output signal is obtained by Provide the D input to the D-type flip-flop; the delay line (DL1) and the second exclusive OR gate (G2) form a pulse generator, the input of the delay line receives the PWM synchronization signal of the 50% duty cycle, the The output of the delay line is also provided to the second XOR gate, which compares the output of the delay line with the 50% duty cycle PWM sync signal to 0% of the PWM period and 50% provide a clock pulse signal to the CLK end of the D-type flip-flop; the D-type flip-flop Q includes a D input, a CLK input, a Q output and a NOT-Q output, and the D input is coupled to the The output of the first exclusive OR gate, the CLK input is coupled to the output of the second exclusive OR gate, the Q output is coupled to the first OR gate, and the NOT-Q output is coupled to the third exclusive OR gate ( G3), when the duty cycle of the PWM color temperature control signal is greater than 50%, the Q output generates a high-level output signal in the first 50% of the PWM synchronous signal period, and then resets in the remaining 50% of the PWM synchronous signal period to a low level, and when the duty cycle of the PWM color temperature control signal is less than 50%, the Q output remains at a low level during the entire PWM refresh cycle. The NOT-Q output of the D-type flip-flop is inverse to the Q output; the first OR gate receives the Q output and the PWM color temperature control signal, performs a logical OR operation, and its output is coupled to the first buffer, the output of the first buffer provides the first pulse width color temperature control signal; the third exclusive OR gate receives the NOT-Q output and the PWM color temperature control signal, and the output is coupled to the second buffer, the output of the second buffer provides the second pulse width color temperature control signal; when the duty cycle of the PWM color temperature control input signal is less than 50%, the output of the first OR gate makes the first The pulse width color temperature control signal changes following the PWM color temperature control signal, and the NOT-Q output of the D-type flip-flop is at a high level, and the output of the third XOR gate makes the second pulse width color temperature control The signal becomes a high-level signal; when the duty cycle of the PWM color temperature control signal is greater than 50%, the output of the first OR gate makes the first pulse width color temperature control signal select the D-type flip-flop The high-level signal output by Q, while the NOT-Q output of the D-type flip-flop is at low level, the output of the third exclusive OR gate makes the second pulse width color temperature control signal follow the PWM color temperature control signal; thus, one of the first pulse width color temperature control signal and the second pulse width color temperature control signal will be in the full-scale output state, while the other will be controlled at the maximum output state and the minimum output state between output states.

According to the fifth aspect of the present application, the above control device further includes: a synchronous signal generator, coupled to the micro control unit and the PWM source selector, when it is determined to select an external PWM color temperature control input signal input from the outside , monitoring and utilizing the external PWM color temperature to control the refresh rate of the input signal, generating a PWM synchronous signal with a 50% duty cycle, replacing the PWM synchronous signal with a 50% duty cycle provided by the micro control unit, and outputting it to the PWM to the pulse width processing unit.

According to a sixth aspect of the present application, in the above control device, when different levels of color temperature and dimming are required, the first pulse width color temperature control signal is set to provide a first proportional pulse width to determine the The magnitude of the first current output, the second pulse width color temperature control signal is set to provide a second proportional pulse width to determine the magnitude of the second current output, the DC level dimming control signal is set to allow The first variable output constant current source controls the first current output within a first percentage of a magnitude determined by the first proportional pulse width and allows the second variable output A constant current source controls the second current output within a second percentage of a magnitude determined by the second proportional pulse width.

According to the seventh aspect of the present application, the above control device includes the following working conditions: when a high color temperature output is required, the first pulse width color temperature control signal is set to provide a pulse width of about 100%, and the second pulse The width color temperature control signal is set to provide a pulse width of about 2%; in conjunction with the range of 0%-100% of the DC level dimming control signal, the first current output of the first variable output constant current source 0%-about 100%, and the second current output of the second variable output constant current source is 0%-about 2%; when low color temperature output is required, the first pulse width color temperature control signal It is set to provide a pulse width of about 2%, and the second pulse width color temperature control signal is set to provide a pulse width of about 100%; in conjunction with the range of 0%-100% of the DC level dimming control signal, the The first current output of the first variable output constant current source is 0% to about 2%, and the second current output of the second variable output constant current source is 0% to about 100%; When a relatively high color temperature output is required, the first pulse width color temperature control signal is set to provide a pulse width of about 100%, and the second pulse width color temperature control signal is set to provide a pulse width of 20%; The range of the DC level dimming control signal is 0%-100%, the first current output of the first variable output constant current source is 0%-about 100%, and the second variable output The second current output of the constant current source is 0%-20%; when a relatively low color temperature output is required, the first pulse width color temperature control signal is set to provide a pulse width of 10%, and the second The pulse width color temperature control signal is set to provide a pulse width of about 100%; in conjunction with the range of 0%-100% of the DC level dimming control signal, the first current of the first variable output constant current source The output is 0%-10% and the second current output of the second variable output constant current source is 0%-about 100%.

According to an eighth aspect of the present application, the control device further includes: an AC-DC power converter, the color temperature control input terminal and the dimming control input terminal of the electronic controller are respectively coupled to the color temperature control input terminal and the The dimming control input terminal, the AC-DC power converter is further coupled to the wall switch; the wall switch can be switched between ON and OFF, and provides the main power input to the AC-DC power supply Converter, the first variable output constant current source and the second variable output constant current source; the AC-DC power converter converts the main power input of the wall switch input into a DC input to supply power to an electronic controller, and based on the switching of the on/off state of the wall switch, generate a main switch detection input signal, which is provided to the color temperature control input end and the dimming control input end of the electronic controller, so The electronic controller provides outputs of the first color temperature control signal, the second color temperature control signal and the dimming control signal according to a preset processing program.

According to a ninth aspect of the present application, the control device includes: an AC-DC power converter, and the color temperature control input terminal and the dimming control input terminal of the electronic controller are respectively coupled to the color temperature control input and the dimming control input terminal of the DC voltage format. a control input, the electronic controller is coupled to an AC-DC power converter; a mains power input is provided to the AC-DC power converter, the first variable output constant current source and the second variable output Constant current source; the AC-DC power converter converts the main power input into a DC input and provides it to the electronic controller; the color temperature control input terminal and the dimming control input terminal of the DC voltage format provide the color temperature of the DC voltage format The control input signal and the dimming control input signal in DC voltage format are sent to the micro control unit in the electronic controller, so that the electronic controller provides the first color temperature control signal, the output of the second color temperature control signal and the dimming control signal.

According to the tenth aspect of the present application, the control device further includes: a wireless module, coupled to the electronic controller, and coupled to a wireless antenna, for wirelessly receiving color temperature control from the user's control device through the wireless antenna The input signal and the dimming control input signal are processed and identified to generate a PWM format color temperature control input signal and a PWM format dimming control input signal; an AC-DC power converter, the electronic controller is coupled to the AC- DC power converter; the main power input provides power to the AC-DC power converter, the first variable output constant current source and the second variable output constant current source; the AC-DC power converter Convert the main power input into a DC input and provide it to the electronic controller and the wireless module; the color temperature control input terminal and the dimming control input terminal of the electronic controller are respectively coupled to the wireless module to receive the color temperature in the PWM format The control input signal and the dimming control input signal in PWM format are further bypassed by the micro control unit and directly provided to the PWM source selector, so that the electronic controller provides the first color temperature according to a preset processing program output of the control signal, the second color temperature control signal and the dimming control signal.

According to the eleventh aspect of the present application, the control device further includes: a wireless module with MCU function, coupled to the electronic controller, and coupled to the wireless antenna, including: a microprocessor with a real-time clock, the The microprocessor communicates with the user's control device through the wireless antenna to obtain the user's time-based control table. The control table can be user-defined and used to specify the color temperature and temperature that need to be adopted at different specific time points every day. Dimming control requirements, the microprocessor stores the control table, and according to the requirements in the control table, outputs the corresponding color temperature control input signal in PWM format and dimming control input signal in PWM format to the electronic controller; an AC-DC power converter, the electronic controller being coupled to the AC-DC power converter; a mains power input being provided to the AC-DC power converter, the first variable Outputting a constant current source and the second variable output constant current source; the AC-DC power converter converts the main power input into a DC input and provides it to the electronic controller and the wireless module with MCU functions; The color temperature control input terminal and the dimming control input terminal of the electronic controller are respectively coupled to the wireless module with MCU function, receive the color temperature control input signal in PWM format and the dimming control input signal in PWM format, and Further bypassing the micro control unit and directly providing to the PWM source selector, so that the electronic controller provides the first color temperature control signal, the second color temperature control signal and the adjustment Light control signal output.

According to a twelfth aspect of the present application, the control device further includes: an AC-DC power converter coupled to the electronic controller, wherein the electronic controller includes a digital lighting control input terminal coupled to an external digital Type lighting control circuit, used to receive the digital lighting control input signal input from the outside; the wall switch can switch between ON and OFF, and provide the main power input to the AC-DC power converter, the The first variable output constant current source and the second variable output constant current source; the digital lighting control input signal is provided to the micro control unit in the electronic controller, and the micro control unit according to A preset processing program generates and provides outputs of the first color temperature control signal, the second color temperature control signal and the dimming control signal based on the digital lighting control input signal.

According to the thirteenth aspect of the present application, the preset processing program is programmable, and is preset in the micro control unit when leaving the factory, and can be programmed and modified according to the needs of different implementation situations or upgrade.

According to the fourteenth aspect of the present application, the first variable output constant current source provides the first current output to the first output coupled to the first output terminal of the first variable output constant current source. a group of LED light emitters, the second variable output constant current source provides the second current output to a second group of LED light emitters coupled to the second output end of the second variable output constant current source; The color temperature of the first group of LED light emitters is higher than the color temperature of the second group of LED light emitters.

According to the fifteenth aspect of the present application, a lighting system is proposed, including: the lighting control device as described in the above multiple aspects; A first group of LED luminous bodies, and a second group of LED luminous bodies coupled to the second output end of the second variable output constant current source; the color temperature of the first group of LED luminous bodies is higher than that of the first group of LED luminous bodies The color temperature of the group LED illuminant.

According to the sixteenth aspect of the present application, a control method of a lighting system is proposed, including: enabling the initialization working state, providing a preset color temperature and brightness effect; judging whether a color temperature control input signal and a dimming control input are received signal; if the color temperature control input signal and dimming control input signal are received, a new working mode is set according to the preset processing procedure; according to the set working mode, corresponding color temperature control signal and dimming control signal are generated to the first A variable output constant current source and a second variable output constant current source; based on the corresponding color temperature control signal and dimming control signal, the first variable output constant current source and the second variable output constant current source Outputting a first current output and a second current output to a first group of LED luminous bodies and a second group of LED luminous bodies, respectively; based on the first current output and the second current output, the first group of LED luminous bodies and the The second group of LED light emitters emit light according to the received DC current output; wherein the first variable output constant current source adjusts the size of the first current output according to the first color temperature control signal, and according to the Both of the dimming control signals are used to adjust the ratio of the first current output, and the second variable output constant current source adjusts the second current output according to the second color temperature control signal, and according to the Both of the dimming control signals are used to adjust the ratio of the magnitude of the second current output, thereby adjusting the color temperature and/or dimming of the luminous effect.

According to the seventeenth aspect of the present application, it further includes: judging whether the power is off, if the power is off, the lighting system is turned off, otherwise, the first group of LED luminous bodies and the second group of LED luminous bodies keep outputting The status is unchanged.

According to the eighteenth aspect of the present application, the preset processing program is programmable, and is preset in the micro control unit when leaving the factory, and can be programmed and modified according to the needs of different implementation situations Or upgrade, the initial working state is preset by the manufacturer in the electronic controller of the lighting system, and provides an initial working mode that can be one of the following: the preset combined color temperature and lumen are the lowest work State, that is, the effect of the lowest color temperature/brightness; the preset combined color temperature and lumens are the highest working state, that is, the effect of the highest color temperature/brightness; the last working state of the combined color temperature and lumens when the previous lighting system was turned off

According to the nineteenth aspect of the present application, judging whether to receive the color temperature control input signal and the dimming control input signal includes: if the color temperature control input signal and the dimming control input signal are not received, continue to maintain the current working mode.

According to a twentieth aspect of the present application, the method is used for controlling the lighting system as described in the above aspects.

The LED lamp realized according to the application can reduce the demand of retailers for the inventory quantity of LED lamps with different color temperatures, provide users with a comfortable lighting environment, and provide end users or commercial users with a low-cost lighting solution suitable for human body perception.

It is to be understood that both the foregoing general description and the following detailed description of the application are exemplary and explanatory and are intended to provide further explanation of the application as claimed.

Description of drawings

The accompanying drawings are included to provide a further understanding of the present application, and they are included and constitute a part of the present application. The accompanying drawings show the embodiments of the present application, and together with the description, serve to explain the principles of the present application. Other features and advantages of the present application will become apparent after reading the following specific, non-limiting examples of the application in conjunction with the accompanying drawings. in:

FIG. 1 is a conceptual schematic structural diagram of a control device according to an embodiment of the present application;

FIG. 2 shows a schematic diagram of the implementation of the electronic controller in FIG. 1 according to an embodiment of the present application;

Figure 2A shows an implementation of a PWM synchronization signal generator;

Fig. 2B shows an embodiment of PWM to pulse width processing unit;

Figure 2C shows an embodiment of a PWM voltage integrator;

FIG. 3 shows a first specific implementation structure according to an embodiment of the present application;

FIG. 4 shows a second specific implementation structure according to an embodiment of the present application;

FIG. 5 shows a third specific implementation structure according to an embodiment of the present application;

FIG. 6 shows a fourth specific implementation structure according to an embodiment of the present application;

FIG. 7 shows a fifth specific implementation structure according to an embodiment of the present application;

Fig. 8 shows a flowchart of a dimming control process according to an embodiment of the present application.

detailed description

Reference will now be made in detail to the preferred embodiments of the present application, examples of which are illustrated in the accompanying drawings. Wherever possible, the same numbers will be used throughout the drawings to refer to the same or like parts. In addition, although the terms used in this application are selected from well-known and commonly used terms, some terms mentioned in the specification of this application may be selected by the applicant according to his or her judgment, and their detailed meanings are listed in this article described in the relevant section of the description. Furthermore, it is required that this application be understood not only by the actual terms used, but also by the meaning implied by each term.

Fig. 1 is a conceptual schematic structure diagram of a control device according to an embodiment of the present application. Figure 1 is mainly composed of three parts: multiple groups of light-emitting diodes (LEDs), a current source that provides DC level output control signals to multiple groups of LEDs, and an electronic controller that controls the current source according to externally input control signals.

As shown in FIG. 1 , electronic controller 102 is configured to implement one or more embodiments of the present application. The color temperature control input terminal and the dimming control input terminal of the electronic controller 102 receive the color temperature control input signal and the dimming control input signal input by the user from the outside, and generate according to the preset program according to the control signals input by the user. Three output control signals: a high color temperature control signal at the high color temperature control output, a low color temperature control signal at the low color temperature control output, and a dimming control signal at the dimming control output. The structure of the electronic controller 102 will be further described in detail below with reference to FIG. 3 . In one embodiment, the high color temperature control signal and the low color temperature control signal are control signals in the form of pulse width, and the dimming control signal is in the form of DC. In one embodiment, the electronic controller 102 can receive conventional user input in various formats, including but not limited to: two independent 0-10V DC light control signals, external input pulse width modulation signal (PWM), LED Control signal for Digital Dimming Scheme (DLT), or Digital Addressable Lighting Interface (DALI). The DLT standard is IEC62756, and the DALI standard is IEC62386. In one embodiment, by means of the electronic controller 102 , the user can use conventional user input to adjust the combined color temperature and light brightness of the LED illuminants to achieve color temperature adjustment/dimming. In one embodiment, by means of the electronic controller 102, the user can use conventional user input to enable/disable the preset control schedule to automatically output the control signal at different specific times of the day to adjust the LED lamps. Color temperature and brightness for a fully automatic ambient lighting solution.

The current sources include a high color temperature variable output constant current source 104 and a low color temperature variable output constant current source 106 . The high color temperature variable output constant current source 104 is coupled to the high color temperature control output terminal and the dimming control output terminal of the electronic controller 102, and has a set of DC current output terminals, and a first DC current output terminal is coupled between the set of DC current output terminals. A group of high color temperature LED illuminants, whereby DC current output is provided to the first group of high color temperature LED illuminants. The low color temperature variable output constant current source 106 is coupled to the low color temperature control output terminal and the dimming control output terminal of the electronic controller 102, and also has a set of DC current output terminals, and a second DC current output terminal is coupled between the set of DC current output terminals. The two groups of low color temperature LED luminous bodies provide DC current output to the second group of low color temperature LED luminous bodies.

In one embodiment, the high color temperature variable output constant current source 104 and the low color temperature variable output constant current source 106 are switching power supply regulators with buck, buck-boost or flyback topology. Although only two variable output constant current sources and the corresponding LED strings are shown in Fig. 1, those skilled in the art can understand that two One or more variable output constant current sources and corresponding LED strings. For example, in another embodiment, four groups of variable output constant current sources and corresponding LED strings can be set. The current descriptions in this application are all exemplary for explaining the high color temperature variable output constant current source 104 and the low color temperature variable output constant current source 106 and the connection relationship, and are not intended to limit the number of implementations thereof.

According to one embodiment, the first group of LED strings with high color temperature and the second group of LED strings with low color temperature are composed of one or more LED chips with color temperature blue light that excites phosphor powder to convert white light, and the composition method can be serial, parallel or series-parallel combination. Compared with other monochromatic spectrum LED chips (such as red LEDs around 650nm), LED chips that excite phosphor powder to convert white light by blue light have better thermal attenuation and aging attenuation characteristics. In this way, they can be operated at different temperatures, or LED lamps with different aging levels can be put together to run without significant color temperature difference. The set color temperature of the first group of high color temperature LED illuminants is different from the set color temperature of the second group of low color temperature LED illuminants. In one embodiment, the color temperature of the second set of LED light emitters is lower than the color temperature of the first set of LED light emitters. In another embodiment, the color temperature of the first group of high color temperature LED light emitters is 7000K, and the color temperature of the second group of high color temperature LED light emitters is 2000K.

The high color temperature variable output constant current source 104 is coupled to the high color temperature control output terminal and the dimming control output terminal of the electronic controller 102 for receiving the high color temperature control signal in pulse width format and the dimming control signal in DC level. The low color temperature variable output constant current source 106 is coupled to the low color temperature control output terminal and the dimming control output terminal of the electronic controller 102 to receive the low color temperature control signal in pulse width format and the same DC level dimming control signal.

For the high/low color temperature control signal in the pulse width format, when the pulse width signal width increases, the DC current output magnitude of the variable output constant current source 104, 106 increases, and when the pulse width signal width decreases, the variable output constant current source The magnitude of the DC current output of 104, 106 is reduced. Thus, by providing pulse width signals of different widths, DC current outputs of different magnitudes can be provided to the first group of high color temperature LED luminous bodies and the second group of low color temperature LED luminous bodies via the variable output constant current sources 104 and 106, by This changes the combined color temperature produced by the first group of high color temperature LED light emitters and the second group of low color temperature LED light emitters. At any time, one of the two pulse width color temperature control signals provided to the variable output constant current sources 104, 106 will be in the full output state, while the other pulse width color temperature control signal will be controlled at the maximum and minimum output state between..

For the DC level dimming control signal, in one embodiment, it may be a voltage control signal of 0-10V, which is used to indicate different dimming control levels to the variable output constant current sources 104 , 106 . The lower the DC level dimming control signal is, the lower the current output ratio of the variable output constant current sources 104 and 106 is. In one embodiment, if the DC level dimming control signal is 10V, then the variable output constant current sources 104, 106 output the full proportion of the current output indicated by the pulse width color temperature control signal, that is, the pulse width color temperature control signal The indicated current output is the full rated output. When the DC level dimming control signal is 5V, the variable output constant current sources 104 and 106 output half of the current output size indicated by the pulse width color temperature control signal, that is, the output is indicated by the pulse width color temperature control signal. 50% of current output size. When the DC level dimming control signal is 2V, the variable output constant current sources 104 and 106 output 20% of the current output value indicated by the pulse width color temperature control signal. It can be seen that the variable output constant current sources 104 and 106 simultaneously provide the final final current output according to both the pulse width color temperature control signal and the DC level dimming control signal.

When different levels of color temperature and dimming are required, the high color temperature control signal provided to the variable output constant current source 104 is set to provide a first proportional pulse width to determine the magnitude of the current output provided to the first group of LED light emitters , the low color temperature control signal provided to the variable output constant current source 106 is set to provide a second proportional pulse width to determine the magnitude of the current output provided to the second group of LED light emitters. At any time, one of the first proportional pulse width and the second proportional pulse width will be at full scale output state, while the other pulse width will be controlled between the maximum and minimum output states. The DC level dimming control signal is set to allow the variable output constant current source 104 to control the current output to the first group of LED light emitters to a first percent of the magnitude determined by the first proportional pulse width ratio range, and allows the variable output constant current source 106 to control the current output provided to the second group of LED light emitters within a second percentage range of the magnitude determined by the pulse width of the second ratio.

A number of possible implementations are given next. Those skilled in the art can understand that the implementations given below are only exemplary, and are not intended to be exhaustive or limited to only these implementations of the present application. Those skilled in the art will know that a synchronous controller is required in a PWM or pulse width control device, which basically cannot provide a full range of 0-100% output pulse width. Therefore, in the following implementation situations, the lowest duty cycle of 2 is selected. % and full duty cycle 100% range to demonstrate..

In one embodiment, when a high color temperature is required, the high color temperature control signal is set to provide a pulse width of 100%, and the low color temperature control signal is set to provide a pulse width of 2%; in conjunction with the DC level dimming control signal The range of 0%-100% allows the current output of the variable output constant current source 104 to be 0%-100% of the size determined by the pulse width of 100%, and allows the current output of the variable output constant current source 106 to be 0%-2% of the magnitude determined by a pulse width of 0%;

When low color temperature is required, the high color temperature control signal is set to provide a pulse width of 2%, and the low color temperature control signal is set to provide a pulse width of 100%; in conjunction with the DC level dimming control signal 0%-100% range, allowing the current output of the variable output constant current source 104 to be 0%-2% of the size determined by the pulse width of 2%, and allowing the second current output of the variable output constant current source 106 to be determined by 100 0%-100% of the magnitude determined by the pulse width of %;

When a relatively high color temperature is required, the high color temperature control signal is set to provide a pulse width of 100%, and the low color temperature control signal is set to provide a pulse width of 20%; with the DC level dimming control signal 0%- The range of 100% allows the current output of the variable output constant current source 104 to be 0%-100% of the size determined by the pulse width of 100%, and allows the current output of the variable output constant current source 106 to be 20% 0%-20% of the size determined by the pulse width;

When a relatively low color temperature is required, the high color temperature control signal is set to provide a pulse width of 10%, and the low color temperature control signal is set to provide a pulse width of 100%; with the DC level dimming control signal 0%- The range of 100% allows the current output of the variable output constant current source 104 to be 0%-10% of the size determined by the pulse width of 10%, and allows the current output of the variable output constant current source 106 to be 100% 0%-100% of the size determined by the pulse width;

It can be seen from the above that when the ratio of the current output of the variable output constant current source 104, 106 is controlled by the DC level dimming control signal, the pulse width of the pulse width signal does not change, thus, the LED The process of adjusting the light of the illuminant and the process of adjusting the temperature of the LED illuminant are independent and can be carried out separately. This improves the user's arbitrariness in controlling color temperature and brightness, and improves user experience.

Fig. 2 shows an implementation schematic diagram of the electronic controller 102 according to an embodiment of the present application. As shown, the electronic controller 102 includes a Micro Control Unit (MCU) as the core control and program storage unit. The MCU can adopt various programmable logic processing devices commonly used in the industry, which include digital and analog input signals sufficient to receive the application, and can store preset programmable programs. For example, the MCU can use the MSP430F series with 10-channel I/O produced by Texas Instruments, or the PIC16F series with 12-channel I/O produced by Microchip Technology. MCU can include multiple general-purpose IO inputs and analog inputs for receiving four input control signals respectively: main switch detection input signal, digital dimming scheme (eg: DALI, DLT) control input signal, DC0-10V color temperature control input Signal, DC0-10V dimming control input signal. The external PWM color temperature control input signal and external PWM dimming control input signal can bypass the MCU and be directly provided to subsequent circuit components (ie, the PWM source selector discussed below). Depending on the implementation, not all of these input control signals may be used. For example, it may only include an analog input for receiving a DC0-10V color temperature control input signal and a DC0-10V dimming control input signal. Based on the externally input control signal and the internal preset program, the MCU outputs an internal PWM color temperature control signal, an internal PWM dimming control signal and (optionally in one implementation) a 50% duty cycle PWM synchronization signal. The electronic controller described in FIG. 2 also includes a PWM source selector, which is coupled to the internal PWM color temperature control signal output terminal and the internal PWM dimming control signal output terminal of the MCU, and is coupled to receive an external PWM color temperature control input signal, an external PWM dimming control signal output terminal, and an external PWM dimming control signal output terminal. Light control input signal. Through the switch selection of the PWM source selector, it can be decided whether to use the internal PWM color temperature control signal and internal PWM dimming control signal output by the MCU or the external PWM color temperature control input signal and external PWM dimming control input signal input from the outside. When adopting internal methods as below (for example, main switch detection input signal, control input signal of digital dimming scheme (eg: DALI, DLT), DC0-10V color temperature control input signal, DC0-10V dimming control input signal) to When input control signals are provided, the MCU converts these input control signals into internal PWM color temperature/dimming control output signals and 50% duty cycle PWM synchronization signals and directly outputs them to the PWM-to-pulse width processing unit, and selects the PWM source The switch of the torter is switched to use the internal PWM color temperature/dimming control input signal. When the external PWM color temperature/dimming control input signal provided by an external method (for example, wireless control terminal) is used as follows, the MCU can be bypassed and the switch of the PWM source selector can be switched to use the external PWM color temperature/dimming control input Signal. The selected (internal or external) PWM color temperature control input signal is used as the PWM color temperature control signal and provided to the PWM to pulse width processing unit, and the selected (internal or external) PWM dimming control input signal is used as the PWM The dimming control signal is provided to the PWM voltage integrator. The switch of the PWM source selector can be realized by a simple double-pole double-throw mechanical switch on the printed circuit board of the electronic controller, or by an electronic switch circuit, and can be preset at the factory, or at the installation site It is up to the installer to choose whether to use external input or internal input as the PWM source.

Further shown here is a synchronous signal generator, which is used to determine the refresh rate of the PWM color temperature control signal, monitor and use the refresh rate of the PWM color temperature control signal to generate a 50% duty cycle PWM synchronous signal, and output it together to the PWM to the pulse width processing unit. In one embodiment, the synchronous signal generator is generally enabled to process the external PWM color temperature control signal when it is determined to select the external PWM color temperature control signal provided by an external means (for example, a wireless control terminal). In one embodiment, when the internal PWM color temperature control signal is selected for factory default or on-site installation, this 50% duty cycle PWM synchronous signal can be directly supplied from the micro control unit to the PWM to pulse width processing unit (the dotted line part in Fig. 2), in this case, the synchronous signal generator may not be used, which saves the related cost of using the synchronous signal generator.

Referring further to FIG. 2A, one embodiment of a PWM synchronization signal generator is shown. The PWM synchronous signal generator uses a common phase-locked loop, which includes a voltage-controlled oscillator (VCO), an exclusive-or gate (XOR) and a "divide-by-two" circuit. The "divide by 2" circuit is implemented by a D-type flip-flop. The VCO is set to operate at twice the frequency of the input signal, and its oscillation range can contain the desired operating frequency of the external PWM color temperature control signal. For example, when the PWM input ranges from 300Hz to 600Hz, the VCO output is 600Hz to 1.2kHz. The output of the VCO is fed back to the XOR gate through the "divided by 2" circuit, and the XOR gate is used as a phase comparator, whose input terminal receives the input signal, and the comparison terminal receives the output of the "divided by 2" circuit, and outputs the phase error value. The phase error value is filtered by the RC network (R1+C1), and the filtered signal is provided to the VCO, which is used to adjust the signal output by the VCO to double the PWM refresh rate, and is provided to the clock signal input terminal C1 of the D-type flip-flop. And the PWM synchronous signal with 50% duty cycle can be output to get from the Q terminal of the D-type flip-flop

The PWM-to-pulse width processing unit generates the high color temperature pulse based on the input PWM color temperature control signal (that is, the internal or external PWM color temperature control signal determined by the source selector) and the PWM synchronization signal with a 50% duty cycle The width color temperature control signal is sent to the high color temperature variable output constant current source 104, and the low color temperature pulse width color temperature control signal is generated to the low color temperature variable output constant current source 106 to control the output of the high color temperature LED illuminant and the low color temperature LED illuminant respectively Brightness, and then achieve the purpose of controlling the final combined output color temperature.

Referring to FIG. 2B, FIG. 2B shows an implementation of the PWM to pulse width processing unit, which includes: a series of pulse generators, logic gates, inverters/buffers and D-type flip-flops.

The 50% duty-cycle sync signal provided by the sync generator or by the MCU is inverted and compared with the PWM color temperature control signal (i.e., the external or internal PWM color temperature control signal used as determined by the source selector ) are compared through the exclusive OR (XOR) gate G1, if the duty cycle of the PWM color temperature control input signal is above 50%, a high level output signal can be obtained at the output of the exclusive OR (XOR) gate G1, and the output signal is Provides the D input to the D-type flip-flop.

The synchronous signal of 50% duty cycle is also connected to the pulse generator composed of the delay line DL1 and the exclusive OR gate G2, wherein the output of the delay line DL1 is also provided to the exclusive OR gate G2, and the exclusive OR gate G2 is compared with the delay line DL1 Output a synchronous signal with a 50% duty cycle to provide a clock pulse signal to the CLK terminal of the D-type flip-flop at two points of 0% and 50% of the cycle of the PWM color temperature control signal.

Thus, based on the output pulse signal received by the D input of the D-type flip-flop and the clock pulse signal received by the CLK terminal, when the duty cycle of the PWM color temperature control input signal is greater than 50%, the Q output is synchronized with the PWM The first 50% of the signal period produces a high level output signal, and then resets to a low level for the remaining 50% of the PWM sync signal period. When the PWM color temperature control input signal is a PWM signal with a duty ratio less than 50%, the Q output is kept at a low level during the entire PWM refresh cycle. The NOT-Q output of the D-type flip-flop is inverse to the Q output.

The signal output by the D-type flip-flop Q passes through the diode D2, and D1 connected from the PWM color temperature control input signal forms an OR gate, which provides an output after a logic OR operation, and the output of the OR gate passes through the first output buffer (Buffer 1) Connect to high color temperature pulse width control signal output 1. The NOT-Q output of the D-type flip-flop and the PWM color temperature control input signal are connected to the low color temperature pulse width control signal output terminal 2 through another exclusive OR gate G3 through the second output buffer (buffer 2 ).

Thus, in combination with the above structure, when the duty cycle of the PWM color temperature control signal (that is, the external or internal PWM color temperature control signal determined and used by the source selector) is less than 50%, the output of the OR gate (that is, the first Pulse width color temperature control signal) changes with the PWM color temperature control signal, and the NOT-Q output of the D-type flip-flop is at high level, and the output of the exclusive OR gate G3 (that is, the second pulse width color temperature control signal) also becomes high Level signal;

When the duty cycle of the PWM color temperature control signal (that is, the external or internal PWM color temperature control signal determined by the source selector) is greater than 50%, the output of the OR gate (that is, the first pulse width color temperature control signal) selects Q output high level signal, while the NOT-Q output of the D-type flip-flop is at low level, the output of the exclusive OR gate G3 (the second pulse width color temperature control signal) changes following the PWM color temperature control signal.

Therefore, at any time, one of the two pulse width color temperature control signals will be in a full-scale output state, while the other pulse width color temperature control signal will be controlled between the maximum and minimum output states.

Now discuss the PWM voltage integrator. The PWM voltage integrator integrates the input PWM dimming control signal (that is, the internal or external PWM dimming control signal determined by the source selector) to generate a smooth DC voltage value proportional to the pulse width as The DC level dimming control signal is provided to the variable output constant current sources 104 and 106 to simultaneously control the dimming brightness of the high color temperature LED light emitter and the low color temperature LED light emitter. One embodiment of a PWM voltage integrator is shown in Figure 2C. Those skilled in the art can understand that various well-known integration circuits can be used to realize the integration of the PWM dimming control signal.

In one embodiment, as shown in FIG. 2C, the PWM dimming control signal output by the source selector is used as an input, and the capacitor C1 is charged through the combination of the diode D1 and the resistor R1. When the PWM dimming control signal is At zero potential, the capacitor C1 discharges the resistor R2, so a voltage integration circuit is formed, and a longer R1/C1/R2 time constant is selected so that the voltage across the capacitor C1 is proportional to the pulse width of the input PWM dimming control signal , the longer the pulse width, the higher the voltage, and the shorter the pulse width, the lower the voltage. The voltage of capacitor C1 is amplified into an output voltage of 0-10V through transistors TR1 and TR2, and the waveform is smoothed by capacitor C2, and then connected to the output terminal through resistor R7, and the output is a stable DC level dimming control proportional to the pulse width Signal.

In this way, through the electronic controller 102 , it is possible to generate predetermined pulse width color temperature control signals and DC level dimming control signals based on externally input control signals in different ways and based on programmable preset programs.

The programmable preset program may be preset in the micro control unit when leaving the factory. Moreover, programming modifications or upgrades can be made according to the needs of different implementation situations.

Different implementation structures of the present application will be described below based on different implementation manners of external user input control signals.

Implementation Structure I

Fig. 3 shows a first specific implementation structure according to an embodiment of the present application. Components in FIG. 3 that are the same as or similar to those in FIG. 1 will use the same names and reference numerals, and will not be repeated here.

Figure 3 uses the user's external input as a wall switch. The wall switch is one of the commonly used control devices in this field, which can be switched between on (ON) and off (OFF). A wall switch can provide mains power input in the form of alternating current AC. FIG. 3 includes an AC-DC power converter coupled to a wall switch for converting incoming mains power input (AC current) into a DC input for electronic controller 102 . At the same time, based on the user's switching of the ON/OFF state of the wall switch (for example, switching from ON to OFF, and then switching to ON), the AC-DC power converter is based on the ON/OFF state of the wall switch. The switching of the state generates a main switch detection input signal, which is provided to the MCU in the electronic controller 102 . At this time, the color temperature control input terminal and the dimming control input terminal of the electronic controller 102 are combined into one, ie used to receive the main switch detection signal. At the same time, the wall switch also provides the main power input to the high color temperature variable output constant current source 104 and the low color temperature variable output constant current source 106 .

Thus, based on the ON/OFF switching of the wall switch by the user, a control input in the form of periodic ON/OFF (for example, ON-OFF-ON is a group indicating a first group of preset states) is provided to The form of the main switch detection input signal instructs the MCU, and based on this, the MCU outputs different internal PWM color temperature control signals and internal PWM dimming control signals to the PWM source selector.

Here, the method of internally inputting the PWM color temperature control signal is used, and the PWM source selector is set (for example, factory setting, or installation site setting) to select the internally input PWM format color temperature and dimming control input signal, which will provide For the sync signal generator, PWM to pulse width processing unit and PWM voltage integrator. As mentioned above, the synchronous signal generator provides a PWM synchronous signal with a 50% duty cycle (the MCU can also directly output a 50% duty cycle PWM synchronous signal without using the synchronous signal generator), and the PWM to The pulse width processing unit generates a corresponding pulse width control signal based on the 50% duty cycle PWM synchronous signal and the input color temperature input control signal in PWM format, and the PWM voltage integrator generates a stable DC modulation proportional to the pulse width. The light control signal is provided to the variable output constant current sources 104 and 106 together, and the variable output constant current sources 104 and 106 then output different DC currents to the high color temperature LED light emitter and the low color temperature LED light emitter.

Table 1 below shows an example of the relationship between control states and outputs:

Table 1

Power switch status Output color temperature (example value) Output Lumen Rating broken Not applicable off, no output Pass 4500K 100% output ON-OFF-ON1 6500K 50% output ON-OFF-ON 2 3000K 50% output On-Off-On 3 2000K 25% output

For example, when the main switch is off, there is no output. When the main switch is connected, the combined color temperature output is 4500K, and the combined brightness output is full scale. When the main switch is turned on and off once, the combined color temperature output is 6500K, and the combined brightness output is 50. %, when the main switch is turned on and off twice, the combined color temperature output is 3000K, and the combined brightness output is 50%. When the main switch is turned on and off three times, the combined color temperature output is 2000K, and the combined brightness output is 25%.

Implementation Structure II

Fig. 4 shows a second specific implementation structure according to an embodiment of the present application. Components in FIG. 4 that are the same as or similar to those in FIG. 1 will use the same names and reference numerals, and will not be repeated here.

The user's external input used in Figure 4 is a knob-type signal input. The knob can be set on the wall (as shown in the figure), or it can be digital input (direct panel input, etc., not shown). In this way, the color temperature control input and the dimming control input of the voltage format (for example, 0-10V) can be directly provided to the electronic controller 102, at this time, the color temperature control input terminal and the dimming control input terminal of the electronic controller 102 That is, respectively coupled to the color temperature control input and the dimming control input in DC voltage format. And further provide to the MCU in Fig. 2. FIG. 4 includes an AC-DC power converter coupled to the main power input for converting the incoming main power input into a DC input for the electronic controller 102 . Meanwhile, in FIG. 4 , the main power input is additionally provided to the variable output constant current sources 104 and 106 .

The MCU in Figure 2 generates corresponding internal PWM color temperature control signals and internal PWM dimming control signals based on the 0-10V signal and provides them to the PWM source selector. The internal method is also used here, and the PWM source selector is set (for example, factory setting, or installation site setting) to select the color temperature and dimming control input signal of the internally input PWM format, and provide it to the synchronous signal generator , PWM to pulse width processing unit and PWM voltage integrator. As mentioned above, the synchronous signal generator provides a PWM synchronous signal with a 50% duty cycle (the MCU can also directly output a 50% duty cycle PWM synchronous signal without using the synchronous signal generator), and the PWM to The pulse width processing unit generates a corresponding pulse width control signal based on the 50% duty cycle PWM synchronous signal and the input color temperature input control signal in PWM format, and the PWM voltage integrator generates a stable DC modulation proportional to the pulse width. The light control signal is provided to the variable output constant current sources 104 and 106 together, and the variable output constant current sources 104 and 106 then output different DC currents to the high color temperature LED light emitter and the low color temperature LED light emitter.

Table 2 below shows an example of the relationship between control states and outputs:

Table 2

Because the color temperature control input and dimming control input adopt the format of DC voltage level of 0-10V, it can provide more delicate output classification. For example, when the dimming control input is 0V, it is considered that there is no brightness output, so no matter how much the color temperature control input is, there is no output. In another control situation, when the color temperature control input is 7V and the dimming control input is 5V, the combined color temperature output is high color temperature (5500K), but since the dimming control input is 5V (that is, it is considered that the user needs half the light Brightness), then both the high color temperature LED illuminant and the low color temperature LED illuminant output dark light (dimmed output). When the dimming control input is 10V, it is considered that the user needs full brightness, and the high color temperature LED illuminant and the low color temperature LED illuminant are respectively controlled to output dark light according to the level of the color temperature control input (3V, 5V, 7V, 10V). Or light.

Implementation Structure III

Fig. 5 shows a third specific implementation structure according to an embodiment of the present application. Components in FIG. 5 that are the same as or similar to those in FIG. 1 will use the same names and reference numerals, and will not be repeated here.

The user's external input used in FIG. 5 is a wireless signal input. Users can wirelessly provide color temperature control input signals and dimming control input signals to the electronic controller 102 through control devices such as smart phones, remote controls, and remote computers. The system in FIG. 5 further provides a wireless antenna for receiving wireless control inputs. signal, and includes a wireless module coupled to a wireless antenna and electronic controller 102. The wireless module processes and recognizes the received control input signal, generates a PWM format color temperature and dimming control input signal, and provides it to the electronic controller 102 . The color temperature control input terminal and the dimming control input terminal of the electronic controller 102 are respectively coupled to the wireless module at this time, receive the above-mentioned color temperature temperature and dimming control input signal in PWM format, and further bypass the MCU in FIG. 2 as an external input The color temperature and dimming control input signal in PWM format is directly provided to the PWM source selector. The control input signal in PWM format can be used to indicate the user's desired color temperature and dimming with a duty cycle. Likewise, FIG. 5 includes an AC-DC power converter coupled to the mains power input for converting the incoming mains power input into a DC input for the electronic controller 102 and the wireless module. In FIG. 5 , the main power input is additionally provided for variable output constant current sources 104 , 106 .

In the implementation structure of Figure 5, since the MCU is bypassed, the PWM source selector will be set (for example, factory settings, or installation site settings) to select the color temperature and dimming control input signal of the externally input PWM format, and set it to Provided to the Sync Signal Generator, PWM to Pulse Width Processing Unit, and PWM Voltage Integrator. As mentioned earlier, the sync signal generator provides a 50% duty cycle PWM sync signal, and the PWM to pulse width processing unit is based on the 50% duty cycle PWM sync signal and the input color temperature input control signal in PWM format , to generate a corresponding pulse width control signal, and the PWM voltage integrator generates a stable DC control signal proportional to the pulse width, both of which are provided to the variable output constant current sources 104, 106, and the variable output constant current sources 104, 106 further outputs different DC currents to the high color temperature LED light emitter and the low color temperature LED light emitter.

Table 3 below shows an example of the relationship between control states and outputs:

table 3

The color temperature control input and the dimming control input adopt the format of wireless signals, and the percentage of the duty cycle of the PWM signal can be used as the control identification. At this time, the specific procedure may be the same as Table 2 of Embodiment II, except that the percentage signal of the PWM signal is used instead of the signal in the voltage level format. For example, corresponding to the situation in Table 2 that the DC color temperature control input is 7V, the DC dimming control input is 5V, and the combined color temperature output is high color temperature (5500K), the PWM color temperature control input used here is 70% duty cycle, and the dimming The light control input is 50% duty cycle, and the combined color temperature output is still high color temperature (5500K). Other situations will not be repeated here.

Implementation Structure IV

Fig. 6 shows a fourth specific implementation structure according to an embodiment of the present application. Components in FIG. 6 that are the same as or similar to those in FIG. 1 will use the same names and reference numerals, and will not be repeated here.

Figure 6 uses the same basic principle as Figure 5 . The difference is that the wireless module in FIG. 6 further has the function of MCU, which includes a microprocessor with a real-time clock. This microprocessor communicates with the user's control device (smart phone, remote control, remote computer, etc.) via a wireless antenna to obtain the user's time-based control schedule. The control table can be customized by the user on the control device to specify the color temperature and dimming control requirements that need to be taken at different specific time points every day, and sent to the wireless module through wireless signals. After obtaining the control table, the microprocessor of the wireless module stores the control table, and outputs the corresponding color temperature control input signal and dimming control input signal (also PWM format) to the electronic controller 102. Similarly, FIG. 6 includes an AC-DC power converter coupled to the main power input for converting the input main power input into a DC input for the electronic controller 102 and the wireless module with MCU functions. In FIG. 6 , the main power input is additionally provided for variable output constant current sources 104 , 106 .

5, the PWM source selector, synchronous signal generator, PWM to pulse width processing unit and PWM voltage integrator in the electronic controller 102 cooperate to control the input signal based on the color temperature of the PWM format provided by the wireless module and dimming control input signal, generate corresponding pulse width control signal and DC dimming control signal to variable output constant current sources 104, 106 as mentioned above, and then output different DC currents to high color temperature LED illuminants and low Color temperature LED illuminant.

Users can use their wireless devices to update, delete, rebuild their control tables, and resend via wireless signals to the wireless module for execution.

Table 4 below shows an example of the relationship between control states and outputs:

Table 4

Table 4 is an example showing the color temperature and brightness requirements at different time points of a day in an office. Among them, for example, during the working hours in the morning (9:00-12:00), the sunlight is strong, the color temperature is required to be medium-high, and the brightness is required to be high; during the working hours in the afternoon (13:00-18:00), high color temperature is used after lunch. Improve employee focus. Afterwards, as the sunlight dims, the color temperature is required to be softer (lower). At noon (12:00-13:00), staff members go out to eat or take a lunch break without working lighting, so the requirements for color temperature and brightness are lower. In the evening (18:00-18:30), the staff gradually leave their posts and do not need working lighting, so the color temperature requirement is relatively low, but basic brightness is required. At night (18:30 to 8:30 the next day), the lighting is turned off and there is no output. Although the final color temperature and brightness output are shown in the format of the preset program table, the electronic controller 102 still operates based on the color temperature control input and dimming control input in PWM format, and in the same way as Table 3 of FIG. 5 The PWM format is converted into a pulse width and a DC control signal is input to the variable output constant current sources 104 and 106, and then different DC currents are output to the high color temperature LED light emitter and the low color temperature LED light emitter.

Implementation Structure V

Fig. 7 shows a fifth specific implementation structure according to an embodiment of the present application. Components in FIG. 7 that are the same as or similar to those in FIG. 1 will use the same names and reference numerals, and will not be repeated here.

The basic principle and structure adopted in FIG. 7 are the same as those in FIG. 4 . The difference is that the electronic controller 102 in FIG. 7 includes a digital lighting control input terminal (that is, the digital lighting control signal input terminal of the micro control unit therein), which is coupled to an external digital lighting control circuit for receiving external input from the user. digital lighting control input signal. The digital lighting control input signal may be according to control input signals of various digital dimming schemes commonly used in the art. For example, Digital Addressable Lighting Interface (DALI), LED Digital Dimming Scheme (DLT), and so on. In this way, instead of separately providing the color temperature control input and the dimming control input, the single-ended input lighting control signal in digital format is directly provided to the electronic controller 102, and further provided to the MCU in FIG. 2 for Indicates information on color temperature control and dimming control. Likewise, in FIG. 7 , the main power input is additionally provided to the electronic controller 102 and variable output constant current sources 104 , 106 .

The MCU in Figure 7 utilizes a preset processing program, based on a single digital format lighting control input signal, performs format decoding according to known control specifications in digital format lighting international standards such as DALI, DLT, and decodes the information from the decoded information Generate corresponding internal PWM color temperature control signals and internal PWM dimming control signals to the PWM source selector.

The internal input method is still used here, and the PWM source selector is set (for example, factory settings, or installation site settings) to select the color temperature and dimming control input signal of the PWM format of the internal input, and provide it to the synchronization signal generator, PWM to pulse width processing unit, and PWM voltage integrator. As mentioned above, the synchronous signal generator provides a PWM synchronous signal with a 50% duty cycle (the MCU can also directly output a 50% duty cycle PWM synchronous signal without using the synchronous signal generator), and the PWM to The pulse width processing unit generates a corresponding pulse width control signal based on the 50% duty cycle PWM synchronous signal and the input color temperature control input signal in PWM format, and the PWM voltage integrator generates a stable DC modulation proportional to the pulse width. The light control signal is provided to the variable output constant current sources 104 and 106 together, and the variable output constant current sources 104 and 106 then output different DC currents to the high color temperature LED light emitter and the low color temperature LED light emitter.

Referring next to FIG. 8 , FIG. 8 shows a flowchart of a dimming control process according to an embodiment of the present application.

The whole process starts from block 800, and the LED lights are turned on. In block 802, the initialization working state is enabled to provide preset color temperature and brightness effects. This initialization working state is pre-set in the electronic controller 102 by the manufacturer when the LED lamp leaves the factory, providing a variety of different initialization jobs To meet the needs of different users, it can be one of the following: the preset combined color temperature and lumens are the lowest working state, that is, the effect of the lowest color temperature/brightness; the preset combined color temperature and lumens are the highest The working state, that is, the effect of the highest color temperature/brightness; the last working state of the combined color temperature and lumens when the LED light was turned off last time. Subsequently, proceed to block 804, keep in the current working mode, the current working mode may be the working mode indicated in the initializing working state; until diamond block 806, judge whether to receive the color temperature control input signal and the dimming control input signal (signal The input method can refer to the accompanying drawings 3-6, select internal input or external input), if not (N), then continue to return to frame 804 to maintain the current working mode, and proceed to frame 808; if (Y) , then in block 807 according to the preset processing program, a new working mode is set with reference to the received color temperature control input signal and dimming control input signal. The new working mode can refer to different output color temperatures and output lumen levels shown in Table 1-4. Then, go back to block 804 to keep in the current newly set working mode. Proceed to block 808 . In block 808 , the electronic controller 102 generates corresponding pulse width control signals and DC control signals to the variable output constant current sources 104 , 106 according to the set working mode and in combination with implementing structures I to IV. Then proceed to block 810 , the variable output constant current sources 104 and 106 respectively output DC currents to the high color temperature LED light emitter and the low color temperature LED light emitter. Next, proceeding to block 812, the high color temperature LED light emitter and the low color temperature LED light emitter emit light according to the received DC current output. Then proceed to diamond block 814, judge whether the power is off, if the power is off, then turn off the entire LED at block 816, otherwise, the high color temperature LED light emitter and the low color temperature LED light emitter keep the output state unchanged, and return to block 804.

Based on the above aspects, the adjustment device for LED lamps and the LED lamp using the device provided by this application have the following outstanding advantages:

1. This application uses LED chips, which are cheap, efficient, long service life, energy-saving and environmentally friendly;

2. The structure of this application is simple, through a single electronic controller to achieve a variety of different levels of final combined color temperature and light brightness output, and in all output color temperature states, at least one group of color temperature LED strips can provide the maximum output, greatly Improve the utilization rate and overall energy efficiency of LED.;

3. This application can be controlled according to a variety of different input methods, meeting the various needs of end consumers or commercial places;

4. This application can realize various preset programs, and realize automatic control of color temperature and brightness according to different specific time points.

Those skilled in the art will also appreciate that various modifications and variations can be made to the above-described exemplary embodiments of the present application without departing from the spirit and scope of the present application. Therefore, it is intended that this application cover the modifications and variations of this application that fall within the scope of the appended claims and their equivalents.

Claims (20)

1. A lighting control device, comprising: The electronic controller has a color temperature control input terminal and a dimming control input terminal, which are respectively used to receive an externally input color temperature control input signal and a dimming control input signal, and has a first color temperature control output terminal, a second color temperature control output terminal, and a dimming control output terminal, for outputting a first color temperature control signal and a second color temperature control signal respectively according to a preset processing program based on the color temperature control input signal and the dimming control input signal input externally to adjust The color temperature of the luminous effect, and output a dimming control signal for dimming; A first variable output constant current source comprising: The first color temperature control input terminal is coupled to the first color temperature control output terminal of the electronic controller, and is used to receive the first color temperature control signal, a dimming control input terminal, coupled to the dimming control output terminal of the electronic controller, for receiving a dimming control signal, The first output terminal provides a first current output; A second variable output constant current source, including: The second color temperature control input terminal is coupled to the second color temperature control output terminal of the electronic controller, and is used to receive the second color temperature control signal, a dimming control input terminal, coupled to the dimming control output terminal of the electronic controller, for receiving a dimming control signal, The second output terminal provides a second current output; Wherein, the first variable output constant current source adjusts the size of the first current output according to the first color temperature control signal, and adjusts the size of the first current output according to both of the dimming control signals The second variable output constant current source adjusts the magnitude of the second current output according to the second color temperature control signal, and adjusts the magnitude of the second current output according to both of the dimming control signals Ratio, by controlling the size and ratio of the first current output of the first variable output constant current source and the second current output of the second variable output constant current source to adjust the color temperature and/or the luminous effect of dimming . 2. The lighting control device according to claim 1, wherein the first color temperature control signal is a first pulse width color temperature control signal, and the second color temperature control signal is a second pulse width color temperature control signal, the The dimming control signal is a DC level dimming control signal. 3. The lighting control device according to claim 2, wherein the electronic controller comprises: The micro control unit stores preset programmable programs and includes multiple IO channels for receiving one or more of the following input control signals: the main switch detection input signal, the control input signal of the digital dimming scheme, The color temperature control input signal in the DC voltage format, the dimming control input signal in the DC voltage format, the micro control unit outputs the internal PWM color temperature control signal, the internal PWM dimming control signal, PWM sync signal with 50% duty cycle; The PWM source selector is coupled to the internal PWM color temperature control signal output terminal and the internal PWM dimming control signal output terminal of the micro control unit, and is coupled to and receives an external PWM color temperature control input signal and an external PWM dimming control input signal, using It is determined whether to select the internal PWM color temperature control signal and internal PWM dimming control signal output by the micro control unit or the external PWM color temperature control input signal and external PWM dimming control input signal input from the outside, and the selected internal The PWM color temperature control signal or the external PWM color temperature control input signal input from the outside is output to the PWM to the pulse width processing unit as the PWM color temperature control signal, and the selected internal PWM dimming control signal or the external PWM dimming control input signal Output to PWM voltage integrator as PWM dimming control signal; PWM to pulse width processing unit, coupled to the output of the PWM source selector, for generating the first pulse width color temperature control signal to the PWM based on the input PWM color temperature control signal and a 50% duty cycle PWM synchronous signal The first variable output constant current source, generating the second pulse width color temperature control signal to the second variable output constant current source, at any time, the first pulse width color temperature control signal and the second One of the pulse width color temperature control signals will be in the full-scale output state, while the other will be controlled between the maximum output state and the minimum output state; A PWM voltage integrator, coupled to the output of the PWM source selector, is used to integrate the input PWM dimming control signal to generate a stable DC voltage value proportional to the PWM pulse width as the DC level adjustment A light control signal is provided to the first variable output constant current source and the second variable output constant current source. 4. The lighting control device according to claim 3, wherein the PWM to pulse width processing unit comprises: The inverter receives the PWM synchronous signal of the 50% duty cycle, and inverts it, and provides it to the first XOR gate (G1); The first XOR gate includes a first input end for receiving the output of the inverter and a second input end for receiving the PWM color temperature control signal, and combines the output of the inverter with the Compared with the PWM color temperature control signal, if the duty ratio of the PWM color temperature control signal is more than 50%, a high level output can be obtained at the output terminal of the first XOR gate, and the output signal is provided to D D input of type flip-flop; A delay line (DL1) and a second XOR gate (G2) form a pulse generator, the input of the delay line receives the PWM synchronization signal of the 50% duty cycle, and the output of the delay line is also provided to the The second exclusive OR gate, the second exclusive OR gate compares the output of the delay line with the PWM synchronous signal with a duty cycle of 50%, so as to provide a clock pulse signal at two points of 0% and 50% of the PWM cycle to The CLK terminal of the D-type flip-flop; The D-type flip-flop Q includes a D input, a CLK input, a Q output and a NOT-Q output, the D input is coupled to the output of the first XOR gate, and the CLK input is coupled to the second XOR gate The output of the OR gate, the Q output is coupled to the first OR gate, the NOT-Q output is coupled to the third exclusive OR gate (G3), when the duty cycle of the PWM color temperature control signal is greater than 50%, Q The output generates a high-level output signal during the first 50% of the PWM sync signal period, and then resets to a low level after the remaining 50% of the PWM sync signal period, and when the duty cycle of the PWM color temperature control signal is less than 50% , the Q output remains low for the entire PWM refresh cycle. And the NOT-Q output of the D-type flip-flop is inverted with the Q output; The first OR gate receives the Q output and the PWM color temperature control signal, performs a logic OR operation and its output is coupled to a first buffer, the output of the first buffer provides the first pulse width color temperature control Signal; The third XOR gate receives the NOT-Q output and the PWM color temperature control signal, and the output is coupled to a second buffer, and the output of the second buffer provides the second pulse width color temperature control signal; When the duty cycle of the PWM color temperature control input signal is less than 50%, the output of the first OR gate makes the first pulse width color temperature control signal follow the PWM color temperature control signal to change, and the D-type flip-flop The NOT-Q output of said third XOR gate is at a high level, and the output of said third XOR gate makes said second pulse width color temperature control signal become a high level signal; When the duty cycle of the PWM color temperature control signal is greater than 50%, the output of the first OR gate makes the first pulse width color temperature control signal select the high-level signal output by the Q of the D-type flip-flop, While the NOT-Q output of the D-type flip-flop is at a low level, the output of the third XOR gate makes the second pulse width color temperature control signal follow the PWM color temperature control signal to change; Thus, one of the first pulse width color temperature control signal and the second pulse width color temperature control signal will be in a full-scale output state, while the other will be controlled between a maximum output state and a minimum output state . 5. The lighting control device according to claim 4, further comprising: A synchronous signal generator, coupled to the micro control unit and the PWM source selector, monitors and utilizes the refresh rate of the external PWM color temperature control input signal when it is determined to select the external PWM color temperature control input signal, A PWM synchronous signal with a 50% duty cycle is generated to replace the PWM synchronous signal with a 50% duty cycle provided by the micro control unit, and output to the PWM to pulse width processing unit. 6. The lighting control device according to claim 4, wherein: Wherein, when different levels of color temperature and dimming are required, the first pulse width color temperature control signal is set to provide a first proportional pulse width to determine the size of the first current output, and the second pulse width color temperature The control signal is configured to provide a second proportional pulse width to determine the magnitude of the second current output, and the DC level dimming control signal is configured to allow the first variable output constant current source to a current output controlled within a first percentage of a magnitude determined by the first proportional pulse width and allowing the second variable output constant current source to control the second current output within the range determined by the first proportional pulse width within a second percentage of the magnitude determined by the second proportional pulse width. 7. The lighting control device according to claim 6, characterized in that it comprises the following working conditions: When high color temperature output is required, the first pulse width color temperature control signal is set to provide a pulse width of about 100%, and the second pulse width color temperature control signal is set to provide a pulse width of about 2%; The range of the DC level dimming control signal is 0%-100%, the first current output of the first variable output constant current source is 0%-about 100%, and the second variable output constant current said second current output of the source is from 0% to about 2%; When low color temperature output is required, the first pulse width color temperature control signal is set to provide a pulse width of about 2%, and the second pulse width color temperature control signal is set to provide a pulse width of about 100%; The range of the DC level dimming control signal is 0%-100%, the first current output of the first variable output constant current source is 0%-about 2%, and the second variable output constant current said second current output of the source is from 0% to about 100%; When a relatively high color temperature output is required, the first pulse width color temperature control signal is set to provide a pulse width of about 100%, and the second pulse width color temperature control signal is set to provide a pulse width of 20%; The range of the DC level dimming control signal is 0%-100%, the first current output of the first variable output constant current source is 0%-about 100%, and the second variable output The second current output of the constant current source is 0%-20%; When a relatively low color temperature output is required, the first pulse width color temperature control signal is set to provide a pulse width of 10%, and the second pulse width color temperature control signal is set to provide a pulse width of about 100%; The range of the DC level dimming control signal is 0%-100%, the first current output of the first variable output constant current source is 0%-10%, and the second variable output constant current The second current output of the source is from 0% to about 100%. 8. The lighting control device according to claim 6, characterized in that it comprises: an AC-DC power converter, the color temperature control input terminal and the dimming control input terminal of the electronic controller are respectively coupled to the color temperature of the DC voltage format a control input terminal and a dimming control input terminal, the AC-DC power converter is further coupled to a wall switch; The wall switch can switch between ON and OFF, and provide main power input to the AC-DC power converter, the first variable output constant current source and the second variable output A constant current source; The AC-DC power converter converts the main power input of the wall switch input into a DC input to supply power to the electronic controller, and generates a main switch detection input signal based on the switching of the on/off state of the wall switch , provided to the color temperature control input terminal and the dimming control input terminal of the electronic controller, The electronic controller provides outputs of the first color temperature control signal, the second color temperature control signal and the dimming control signal according to a preset processing program. 9. The lighting control device according to claim 6, characterized in that it comprises: an AC-DC power converter, the color temperature control input terminal and the dimming control input terminal of the electronic controller are respectively coupled to the color temperature of the DC voltage format. a control input and a dimming control input, the electronic controller being coupled to an AC-DC power converter; a mains power input is provided to the AC-DC power converter, the first variable output constant current source and the second variable output constant current source; The AC-DC power converter converts the main power input into a DC input for the electronic controller; The color temperature control input terminal and the dimming control input terminal in the DC voltage format provide the color temperature control input signal in the DC voltage format and the dimming control input signal in the DC voltage format to the micro control unit in the electronic controller, so that The electronic controller provides outputs of the first color temperature control signal, the second color temperature control signal and the dimming control signal according to a preset processing program. 10. The lighting control device according to claim 6, further comprising: A wireless module, coupled to the electronic controller and a wireless antenna, is used to wirelessly receive the color temperature control input signal and the dimming control input signal from the user's control device through the wireless antenna, process and identify the input signal, and generate Color temperature control input signal in PWM format and dimming control input signal in PWM format; an AC-DC power converter to which the electronic controller is coupled; The main power supply input provides power to the AC-DC power converter, the first variable output constant current source and the second variable output constant current source; The AC-DC power converter converts the main power input into a DC input for the electronic controller and the wireless module; The color temperature control input terminal and the dimming control input terminal of the electronic controller are respectively coupled to the wireless module, receive the color temperature control input signal in PWM format and the dimming control input signal in PWM format, and further bypass the micro control The unit is directly provided to the PWM source selector, so that the electronic controller provides the output of the first color temperature control signal, the second color temperature control signal and the dimming control signal according to a preset processing program. 11. The lighting control device according to claim 6, further comprising: A wireless module with MCU function, coupled to the electronic controller, and coupled to the wireless antenna, including: a microprocessor with a real-time clock, the microprocessor communicates with the user's control device through the wireless antenna, and obtains A user-based time control table, the control table may be user-defined and used to specify the color temperature and dimming control requirements that need to be taken at different specific time points every day, the microprocessor stores the control table, And according to the requirements in the control table, output the corresponding PWM format color temperature control input signal and PWM format dimming control input signal to the electronic controller when a specific time point arrives; an AC-DC power converter to which the electronic controller is coupled; a mains power input is provided to the AC-DC power converter, the first variable output constant current source and the second variable output constant current source; The AC-DC power converter converts the main power input into a DC input for the electronic controller and the wireless module with MCU function; The color temperature control input terminal and the dimming control input terminal of the electronic controller are respectively coupled to the wireless module with MCU function, and receive the color temperature control input signal in PWM format and the dimming control input signal in PWM format, And further bypass the micro control unit and directly provide to the PWM source selector, so that the electronic controller provides the first color temperature control signal, the second color temperature control signal and the Dimming control signal output. 12. The lighting control device of claim 6, comprising: an AC-DC power converter coupled to the electronic controller, Wherein the electronic controller includes a digital lighting control input terminal coupled to an external digital lighting control circuit for receiving an external digital lighting control input signal; The wall switch can switch between ON and OFF, and provide main power input to the AC-DC power converter, the first variable output constant current source and the second variable output A constant current source; The digital lighting control input signal is provided to the micro control unit in the electronic controller, and the micro control unit generates and provides the digital lighting control input signal based on the digital lighting control input signal according to a preset processing program The output of the first color temperature control signal, the second color temperature control signal and the dimming control signal. 13. The lighting control device according to claim 6, characterized in that, the preset processing program is programmable, and is preset in the micro control unit when leaving the factory, and can be set according to different Implementations may require programming modifications or upgrades. 14. The light emitting control device according to claim 6, wherein the first variable output constant current source provides the first current output to all the LEDs coupled to the first variable output constant current source The first group of LED light emitters at the first output end, The second variable output constant current source provides the second current output to a second group of LED light emitters coupled to the second output terminal of the second variable output constant current source; The color temperature of the first group of LED light emitters is higher than the color temperature of the second group of LED light emitters. 15. A lighting system comprising: The lighting control device according to claims 1-14; a first group of LED light emitters coupled to the first output terminal of the first variable output constant current source, and a second group of LED light emitters coupled to the second output terminal of the second variable output constant current source; The color temperature of the first group of LED light emitters is higher than the color temperature of the second group of LED light emitters. 16. A method of controlling a lighting system, comprising: Enable the initialization working state to provide preset color temperature and brightness effects; judging whether the color temperature control input signal and the dimming control input signal are received; If the color temperature control input signal and the dimming control input signal are received, a new working mode is set according to a preset processing procedure; Generate corresponding color temperature control signals and dimming control signals to the first variable output constant current source and the second variable output constant current source according to the set working mode; Based on the corresponding color temperature control signal and dimming control signal, the first variable output constant current source and the second variable output constant current source respectively output a first current output and a second current output to the first group of LEDs to emit light body and the second group of LED light emitters; Based on the first current output and the second current output, the first group of LED light emitters and the second group of LED light emitters emit light according to the received DC current output; Wherein the first variable output constant current source adjusts the magnitude of the first current output according to the first color temperature control signal, and adjusts the magnitude of the first current output according to both of the dimming control signals ratio, the second variable output constant current source adjusts the magnitude of the second current output according to the second color temperature control signal, and adjusts the ratio of the magnitude of the second current output according to both of the dimming control signals , thereby adjusting the color temperature and/or dimming of the glow effect. 17. The method of claim 16, further comprising: Judging whether the power is off, if the power is off, the lighting system is turned off, otherwise, the output state of the first group of LED luminous bodies and the second group of LED luminous bodies remains unchanged. 18. The method according to claim 16, characterized in that, the preset processing program is programmable, and is preset in the micro-control unit when leaving the factory, and can be set according to different implementation conditions The need for programming modification or upgrade, the initial working state is preset by the manufacturer in the electronic controller of the lighting system, and provides an initial working mode that can be one of the following: The pre-set combined color temperature and lumens are the lowest working state, that is, the effect of the lowest color temperature/brightness; The pre-set combined color temperature and lumens are the highest working state, that is, the effect of the highest color temperature/brightness; Combined color temperature and lumens last operating state when the lighting system was last turned off. 19. The method according to claim 16, wherein judging whether the input signal for color temperature control and the input signal for dimming control is received comprises: if the input signal for color temperature control and input signal for dimming control is not received, keep the current working mode. 20. A method according to any one of claims 16-19, characterized in that said method is used to control a lighting system according to claim 15.